CSA - Sample 5 Why's for Tire Tread Violations

Violation

A roadside inspection report for a motor carrier showed the following violation: §393.75(c): Tire – Other tread depth less than 2/32 of an inch.

The motor carrier will want to find out the root cause of this Vehicle Maintenance BASIC violation.

Question 1: Why did this event take place?

Answer: The driver did not use a tire depth gauge. Instead, he visually inspected the trailer tire during pre-trip and post-trip inspections. Because of this, it was not noted on the most recent post-trip inspections. In addition, the same driver was assigned to the vehicle for the past few months so no one else was involved in pretrip and post-trip inspection process.

Question 2: Why was this not discovered during the vehicle’s scheduled preventative maintenance?